<template>
<div>
  <el-container>
    <el-header>图书管理系统</el-header>
    <el-container>
      <el-aside width="200px">
        <el-row class="tac">
          <el-col :span="24">
            <el-menu
              default-active="2"
              class="el-menu-vertical-demo"
              @open="handleOpen"
              @close="handleClose"
             router>
              <el-submenu index="1">
                <template slot="title">
                  <i class="el-icon-location"></i>
                  <span>图书列表</span>
                </template>
                <el-menu-item-group>
                  <el-menu-item index="/mainPage/bookList">全部图书</el-menu-item>
                  <el-menu-item index="1-2">以借图书</el-menu-item>
                  <el-menu-item index="1-3">以还图书</el-menu-item>
                </el-menu-item-group>
              </el-submenu>

              <el-menu-item index="2">
                <i class="el-icon-menu"></i>
                <span slot="title">学生列表</span>
              </el-menu-item>
              <el-menu-item index="3">
                <i class="el-icon-document"></i>
                <span slot="title">教师列表</span>
              </el-menu-item>
              <el-menu-item index="4">
                <i class="el-icon-setting"></i>
                <span slot="title">导航四</span>
              </el-menu-item>
            </el-menu>
          </el-col>
        </el-row>
      </el-aside>
      <el-main>
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</div>
</template>

<script>
export default {
  name: 'mainPage',
  methods: {
    handleOpen (key, keyPath) {
      console.log(key, keyPath)
    },
    handleClose (key, keyPath) {
      console.log(key, keyPath)
    }
  }
}
</script>

<style scoped>
.el-header, .el-footer {
  background-color: #B3C0D1;
  color: #333;
  text-align: center;
  line-height: 60px;
}

.el-aside {
  background-color: #D3DCE6;
  color: #333;
  text-align: center;
  line-height: 200px;
}

.el-main {
  background-color: #E9EEF3;
  color: #333;
  text-align: center;
  /*line-height: 160px;*/
}

body > .el-container {
  margin-bottom: 40px;
}

.el-container:nth-child(5) .el-aside,
.el-container:nth-child(6) .el-aside {
  line-height: 260px;
}

.el-container:nth-child(7) .el-aside {
  line-height: 320px;
}
</style>
